Tire pump



July 4, 1933.

E. J. SULLIVAN TIRE PUMP Filed May 5, 1932 I WN W1 Orgy;

Patented July 4, 1933 lilan EVERBABD JOHN SULLEVAN, 6F BACIIIE, WZSCONSEN, ASSIGNOR T WALKER MANU- FAGTUBING CGZ4EPANY,0I' BACIIIE, WISCOIIEHN, CUR'E'ORATION 0F WISCONSIN TIRE PUMP Application filed May 5, 1932. Serial No. 609,459.

This invention relates to certain new and useful improvements in a tire pump, of the small hand operated type adapted for carrying in a tool-kit for the. emergency 11lfiation of tires.

1 1e principao ec or u -e lnven ion is to provide an improved means for simply and economically securing the pump cylinder within the supporting base plate.

Other objects and advantages of the in vention will be more apparent from the following detailed description of one approved type of tire pump built according to the principles of this invention.

In the accompanying drawing:

Fig. 1 is a side elevation of the complete pump.

Fig. 2 is a central vertical section through the lower portion of the pump, taken substantially on the line 2-2 of Fig. 3.

Fig. 3 is a horizontal section taken substantially on the line 33 of 2.

The pump comprises a tubular cylinder 1 of any suitable length formed of sheet metal in a well known manner. The base plate 2 in the form here shown is stamped or pressed from sheet metal and is of an oblong or elliptical form to provide a foot rest at either side of the vertical pump cylinder 1. The edges of the base 2 flanged downwardly at 4C, and the central por tion of the base is prssed downwardly to form an open socket for snugly receiving the lower end of th tube 1. This socks is enclosed between the downwardly extend ing side walls 5 and the substantially horizontal bottom wall 6. so that the socket opens upwardly. The lower end portion 7 of the tube 1 adapted to fit snugly within the socket, but need not be connected therewith by screw threads or other external securing means, as is usual in such constructions.

A rather thin metal disc 8 of sul'istantially uniform thickness is dished upwardly. that is, is convex on its upper surface and concave on. its lower surface. and is of diameter such that it will fit fairly snugly within the tube 1, but may be forced downwardly through this tube with the convened or crowned surface of the disc 8 uppermost.

When the disc 8 reaches the lower end of the tube, additional pressure exerted by a mandrel or other means projecting downwardly through the tube will tend to flatten out the disc and expand its periphery into tight engagement with the lower end 7 of the tube, thus jamming or expanding the tube into engagement with the wall 5 of the socket and tightly sealing the parts together.

One side wall of the tube 1 is bulged outwardly, as indicated at 9, adjacent the lower endof the tube, and a metallic nipple 10 is riveted within this bulged porti0n9, the flexible air hose 11 being secured to the nipple by a suitable clamping means indicated at 12'. The other end of the hose 11 is provided with a fitting 13 for engagement with the tire-valve in well known manner.

The piston rod 1 1 provided with a suitable handle 15 at its upper end, projects downwardly through the clamp 16 mounted in any suitable manner on the upper end of tube 1.

The piston carried at the lower end of rod 1 1 comprises the leather cup or gasket 17, the upper metal plate or washer 18,.and the lower spacing cup 19, this assembly being secured together by the downwardly projecting reduced end portion 20 of the rod 14 which projects through suitable openings in the members 17, 18 and 19 and is riveted over at its lower end, as indicated at 21. A short compression spring 22 is mounted around the rod 14 above the plate 18 to engage the cap 16 at the upper end of the stroke and absorb shocks. As the piston is forced downwardly, the leather cup 17 willeXpand and trap the air, which is compressed and forced outwardly through the tube 11 in the usual man ner. The spacing cup 19 will engage the upper surface of sealing disc 8 and limit the downward stroke of the piston so as to prevent injury to the sealing gasket 17 by engagement with the nipple 10. It will be apparent that the engagement of cup 19 with the upwardly dished surface of disc 8 at the lower end of the stroke will tend to seal the base and tube even more firmly together instead of having any tendency to break the connection between these parts. The parts are all of simple construction and easy to asdisc forced downwardly through the tube and expanded Within the lower end of the tube by pressure applied upon the upwardly extending crown of the disc so that the peripheral edge of the disc is forced outwardly to clamp the tube within the cylindrical socket.

2. In a tire pump, a tubular pump cylinder, a sheet metal supporting base formed with an upwardly opening socket shaped to snugly receive the lower end of the tube, an upwardly dished metal disc forced down.- wardly through the tube and expanded within the lower end of the tube by pressure applied upon the upwardly extending crown of the disc to secure the tube within the socket, an outlet nipple mounted in one wall of the tube adjacent the base, and a piston assembly movable vertically within the cylinder and comprising a downwardly cupped gasket and a downwardly projecting rigid member adapted to engage the upper crowned surface of the sealing disc to limit the downward stroke of the piston before the gasket engages the nipple.

EVER-HARD JOHN SULLIVAN. 

